The Amon Sûl-stone was a palantír that rested in the ArnorianTower of Amon Sûl. Like the other seeing-stones it was a deep black crystal, spherical, and perfectly smooth. However, the stones were not all alike and the Amon Sûl-stone, like the Osgiliath-stone, was too large to be lifted by one man.[1]

With these and other heirlooms, he fled into the far north, where he was given shelter by the Lossoth. At last a ship from the Grey Havens came to rescue Arvedui, but after he had boarded, its hull was crushed by the ice, and all aboard were lost. The Stone of Annúminas, along with that of Amon Sûl, were lost in the shipwreck, and sank.[3]